.tree .tree-checkbox li a, 
.tree .tree-checkbox li a.unchecked {
	background-image:url("check_0.png"); 
}
.tree .tree-checkbox li a.undetermined {
	background-image:url("check_1.png"); 
}
.tree .tree-checkbox li a.checked {
	background-image:url("check_2.png"); 
}
.tree .tree-checkbox li a.clicked,
.tree .tree-checkbox li span.clicked {
	background-color:transparent;
	border-color:transparent;
	color:black;
}